Support "new" on lists.

src/wren_core.c

@@ -358,6 +358,11 @@ DEF_NATIVE(fn_toString)
   RETURN_VAL(wrenNewString(vm, "<fn>", 4));
 }
 
+DEF_NATIVE(list_instantiate)
+{
+  RETURN_OBJ(wrenNewList(vm, 0));
+}
+
 DEF_NATIVE(list_add)
 {
   ObjList* list = AS_LIST(args[0]);
@@ -936,8 +941,6 @@ void wrenInitializeCore(WrenVM* vm)
 
   // Define the methods specific to Class after wiring up its superclass to
   // prevent the inherited ones from overwriting them.
-  // TODO: Now that instantiation is controlled by the class, implement "new"
-  // for List.
   NATIVE(vm->classClass, " instantiate", class_instantiate);
   NATIVE(vm->classClass, "name", class_name);
 
@@ -1041,6 +1044,7 @@ void wrenInitializeCore(WrenVM* vm)
   wrenInterpret(vm, "Wren core library", libSource);
 
   vm->listClass = AS_CLASS(findGlobal(vm, "List"));
+  NATIVE(vm->listClass->metaclass, " instantiate", list_instantiate);
   NATIVE(vm->listClass, "add ", list_add);
   NATIVE(vm->listClass, "clear", list_clear);
   NATIVE(vm->listClass, "count", list_count);

src/wren_value.h

@@ -616,7 +616,7 @@ void wrenPrintValue(Value value);
 
 // Returns true if [value] is a bool. Do not call this directly, instead use
 // [IS_BOOL].
-inline bool wrenIsBool(Value value)
+static inline bool wrenIsBool(Value value)
 {
 #if WREN_NAN_TAGGING
   return value.bits == TRUE_VAL.bits || value.bits == FALSE_VAL.bits;
@@ -627,13 +627,13 @@ inline bool wrenIsBool(Value value)
 
 // Returns true if [value] is an object of type [type]. Do not call this
 // directly, instead use the [IS___] macro for the type in question.
-inline bool wrenIsObjType(Value value, ObjType type)
+static inline bool wrenIsObjType(Value value, ObjType type)
 {
   return IS_OBJ(value) && AS_OBJ(value)->type == type;
 }
 
 // Converts the raw object pointer [obj] to a [Value].
-inline Value wrenObjectToValue(Obj* obj)
+static inline Value wrenObjectToValue(Obj* obj)
 {
 #if WREN_NAN_TAGGING
   return (Value)(SIGN_BIT | QNAN | (uint64_t)(obj));

test/list/new.wren

@@ -0,0 +1,6 @@
+var list = new List
+
+IO.print(list.count) // expect: 0
+IO.print(list) // expect: []
+list.add(1)
+IO.print(list) // expect: [1]